EP0772508B1 - Verfahren und anordnung zum schweissen von werkstücken - Google Patents
Verfahren und anordnung zum schweissen von werkstücken Download PDFInfo
- Publication number
- EP0772508B1 EP0772508B1 EP95927670A EP95927670A EP0772508B1 EP 0772508 B1 EP0772508 B1 EP 0772508B1 EP 95927670 A EP95927670 A EP 95927670A EP 95927670 A EP95927670 A EP 95927670A EP 0772508 B1 EP0772508 B1 EP 0772508B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- workpieces
- welding
- process according
- workpiece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/015—Butt welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/04—Welding by high-frequency current heating by conduction heating
- B23K13/043—Seam welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/08—Electric supply or control circuits therefor
Definitions
- the invention relates to a method and an arrangement for welding workpieces with the characteristics in Preamble of the main procedural and substantive claim.
- Such a method and arrangement is known from the DE-B-1 099 665 known. It shows the conductive warming of two sheets to be butt-welded together by means of a high frequency alternating current which is applied to the Sheets is created and using the Skin effect flows along the sheet metal edges near the gap. As soon as the edges of the sheet are sufficiently plasticized, they become blunt by an upsetting device compressed. The sheets are with each other and with the Welding current source via corresponding lines in series switched. The current flow at the metal edges can different ways by means of current dissipation electrically conductive clamping elements are influenced, with an additional possibility of influence over a Geometric change in the front contour of the clamping elements and a variation in the distance of the clamping element edges from the sheet metal edges.
- the current flow can also influenced inductively via rods made of magnetic material be on one or both sides of the sheets next to the Sheet edges are placed. In the gap area can also a rod link must be present, which is not itself is powered by its electrical Conductivity also has an inductive effect has the flow of electricity.
- the Welding power source is timed by a Switch turned on and off, including the Compression device is time-controlled. The heating current is only switched on and off, but during the heating phase not changed in amplitude.
- US-C 3 591 757 also shows several Exemplary embodiments for the conductive heating of two Sheet metal to be welded together.
- the two sheets are electrically parallel to one another switched, with an electrical in the gap area Return conductor is present.
- high-frequency heating or welding current on the sheet metal edges be focused on what's electrical Parallel connection of the sheets and the required However, return conductors are not in the desired effective Way happens.
- the heating current frequency must for one uniform heating with increasing sheet thickness lower be what on the other hand an undesirable Broadening of the current track and the associated Heating depth.
- the heating or Welding current only switched on, but not modulated.
- DE-A 22 31 717 shows a further variant of the stump or Overlap welding of sheets by means of a high frequency alternating current, the sheets in similar to that of the aforementioned U.S. document are connected in parallel.
- an electric one practices Return conductors have an inductive influence on the current flow, but with the same disadvantages as the US scripture is affected.
- a magnetic pulse after switching off the Heating current can be triggered with the Overlap welding pressed the sheet metal edges together will.
- the capacity will be of its own DC source is charged and is connected in opposite polarity, so that the triggered pulse in the opposite direction to the heating current flows.
- the heating current is also here during the Warming phase constant.
- US-A 2 625 637 shows a welding or soldering process with an inductive heating of the workpieces by a high frequency alternating current.
- the welding current is only a melt generated by different Guiding measures at the welding point stabilized and is held.
- the document discloses an electricity program. This only refers to this Fusion-based welding processes and has none Regarding an onset of upsetting. It also shows Electricity program not only a high welding current, but also a subsequent lower post-heating phase, which for Welding process is one of them.
- the invention has for its object a method and to show an arrangement for welding that the set quality requirements, a have wide scope and little Restrictions apply.
- the invention solves this problem with the features in Main procedural and substantive claim.
- the Measures have a positive effect on the depth of the Heat affected zone and on the welding precision.
- the coating is advantageously only in the welding area to the Sheet metal edges removed and remain on the others Get sheet metal areas.
- the exposure of the sheet metal edges in the welding zone has beneficial effects on the Welding quality.
- the welding technology according to the invention has particular advantages in terms of speed and ease Manageability of the welding process and Welding arrangement. There are particularly cheap and sensitive influence to control the Welding process and to ensure the desired Welding quality.
- Welding processes are carried out in which the Sheet metal edges using the skin effect with high-frequency alternating current can be heated. You can also the basic features of the state of the art known welding techniques are used.
- the Workpieces can be conductive, i. H. by a created Current flow, or inductive through electromagnetic Alternating fields are heated.
- stump and Overlap welding is also any other technique to create the welded joint between the heated ones Sheet edges can be used.
- the sheets conductive heated and in line with the Welding current source switched. Through the series connection can the current trace and thus the heat input via the entire face of the two sheets is influenced as desired and in particular can be kept constant.
- the edges of the work piece run counter to each other at the gap flowed through. This leads to a more even one Warming of the workpiece edges.
- the current frequency is not determined by the sheet thickness and can be essentially choose freely. It can be set very high.
- the heat affected zone can thus be kept correspondingly narrow will. This enables short unclamping lengths, longer ones Sheet rigidity and thus also the application of the Connect required crushing force. On the other hand, it drops the shortening of the sheet. The result is increased precision the welded joint and the components. The bulge and the need for rework are reduced.
- the invention also provides for the supply of energy and consciously introducing heat into the two sheets to control differently and if necessary also during change the welding process.
- This enables Workpieces with different sheet thicknesses and / or to weld different materials.
- Light metals in particular Aluminum compounds, is reducing and Controllability of the heat affected zone is a great advantage. It can also be other di- and / or paramagnetic Weld the materials well together.
- the different heat input of the workpieces can on the one hand through current dissipation by means of a Additional conductor, suitable clamping elements or with the like. other suitable measures can be achieved.
- a Additional conductor preferably for that because of the smaller thickness and / or more thermally sensitive due to material reasons Sheet metal, is brought in by the current discharge Reduced heat quantity, so that both workpieces are preferred have the same welding temperature.
- the welding process according to the invention has a high level Efficiency. Due to the concentrated warming of the End faces are also longer seam lengths with the same Generator power than possible in the prior art. On the other hand, smaller and cheaper welders are built. Also the smaller specific compressive force affects one Possibility of machine downsizing.
- the workpieces (3,4) are 1 to 5 are essentially flat sheets, for example from vehicle construction.
- Figure 6 shows one Variant with workpieces (3,4), which is spatially arbitrary deformed contour (18) and e.g. profile-like with a C-shaped cross section are trained. But others can too Workpiece types are used.
- Workpieces (3,4) in the geometric dimensions, in particular their thickness and the same material.
- the Workpieces (3,4) can also be thermal be differently sensitive.
- the thinner sheet (4) is thermally more sensitive than the thicker sheet (3).
- the different sheet thicknesses of the workpieces (3,4) can vary.
- a preferred area of application are Differences in thickness from approx. 1.5 to 2.5.
- Such sheets or boards are for example in the Automotive technology used.
- the thermally sensitive workpiece (4) has then, for example, a melting point lower than that thermally insensitive workpiece (3).
- the sheet (4) consists of aluminum and the sheet (3) Stole.
- the sheets (3,4) can be made of any electrically conductive and plasticizable materials, especially metals. It can iron and Be non-ferrous metals.
- welding technology can be use for lap welding. Possibly can also the impulse technique to compress or Upset the sheet metal edges are used.
- the gap (7) preferably has a constant width, i.e. the Sheet edges run parallel.
- the gap (7) can Have a width of approx. 2 - 3 mm. But there are also others Gap widths possible.
- the gap width acts as Process size and is variable by means of Clamping (14) or in another suitable manner adjustable.
- the welding device (1) consists of a power source (2), a clamping (14) with several clamping elements (15,16) for the sheets (3,4) and an upsetting device (8) (not shown).
- the current source (2) has one Generator for generating a high-frequency alternating current from approx. 10-1000 KHz. It also includes one programmable controller (12) consisting of a Microprocessor-based computers, several Data storage and suitable input and Output units for the data. The controller (12) has one or several saved electricity programs.
- Fig. 7 shows an example flow chart.
- the welding current source (2) is connected via connecting lines (9) connected to the two front sides of the sheets (3, 4). The connection is preferably close to the gap. On the opposite plates are through (3,4) a connecting line (10) to each other electrically conductively connected. So that the sheets (3,4) and Power source (2) connected in series with each other. The Current flow direction is symbolized by arrows (6). On The current flows through the edges of the sheets (3, 4) near the gap in opposite directions.
- the two sheets (3,4) are created by the high-frequency alternating current at the edges near the gap warmed up.
- the current flows using the Skin effect especially on the sheet metal edges along the Gap (7).
- upsetting is done by a suitable one Measuring device of the compression path and / or the shortening of the sheet measured or calculated.
- the current source (2) can be any and changeable Frequency work.
- the current or the power can be through the control (12). It is advisable a frequency of at least 10 kHz, preferably more than 400 kHz.
- 400 kHz is used for welding Aluminum sheets preferably 500 to 600 KHz.
- the Frequency can be increased up to 1 MHz and above.
- the selected frequency of the alternating current depends on essential of the material pairing of the workpieces (3,4) from.
- the sheet thicknesses and the seam lengths can be in wide limits vary without an adjustment of the Frequency or the generator must take place.
- the Penetration depth of the current at the sheet edges near the gap and therefore the heat affected zone is of the Frequency of the alternating current depends.
- the depth of penetration or heat affected zone decreases with increasing frequency.
- At sheets of different thicknesses (3,4) can optionally and in addition to the current discharge described below by an additional conductor (5) also influencing the Heat affected zone by the level of the frequency.
- the welding process can be done with a current program be performed.
- the electricity program is in the Control (12) stored in a suitable data memory and is processed by the controller (12). In doing so the workpieces (3, 4) in a suitable manner over several selectable periods with different high currents acted upon.
- Figure 7 shows in a schematic representation Electricity program in a flow chart. The process can are divided into two parts, namely a first Phase in which a coating of the sheet metal edges is removed and a second phase with the actual heating and welding area.
- the sheets (3, 4) can have a coating (23), the z. B. consists of a zinc coating.
- the coating (23) is in the welding zone at the sheet metal edges undesirable and the structure of the weld seam can be unfavorable influence.
- the coating is applied before the actual welding process (23) by one or more, preferably two short ones Current pulses with the high-frequency alternating current removed.
- the amplitude and duration of the current pulses (19) depends according to the type of coating (23). In the preferred Embodiment, the sheet metal edges are heated so far that the coating (23) melts and evaporates there.
- the first current pulse (19) can be twice as high be long like the others. Between the current pulses (19) it is advisable to take a break (20) during which the Electricity is switched off or at least significantly reduced. During this time, the sheet metal edges can cool down briefly. It it is advisable to have such between all current pulses (19) Take breaks (20). In a practical The embodiment takes two when welding zinc-coated steel sheets the first current pulse (19) approx. 100 msec and the second current pulse (19) approx. 50 msec. The intermediate pause (20) can be as long as that second current pulse (19).
- the sheets (3, 4) are used for the actual welding process. for heating with the high-frequency alternating current as Heating current or base current (21) applied.
- the basic current (21) can immediately after the last current pulse (19) be switched on. In between, however, can also another pause (20), in which the current in turn is switched off or at least significantly reduced. If in the electricity program the previously described first phase with the Removal of the coating is provided by the Preheating the subsequent heating phase can be shortened.
- the base current (21) is then switched on for less time as current programs and sheet metal pairings, in which none Coating is present and must be removed.
- the current pulses (19) becomes the coating (23) according to the heating depth in the sheets (3,4) only in a narrow area along the sheet metal edges in the Removed welding zone.
- Figure 6 illustrates this with dashed lines.
- the heating process can have various parameters can be controlled, e.g. about the sheet temperature that brought in energy or time.
- the welding device (1) has corresponding measuring devices (not shown), which are connected to the controller (12).
- the amplitude of the increase is e.g. the Two to three times the base current amplitude. At the The welding current will swell in time before the Touching the workpieces (3,4) lowered to "0".
- the welding device (1) or welding arrangement of Fig. 1 to 4 has for welding workpieces (3, 4) different thermal sensitivity current-carrying electrical auxiliary conductor (5) on the is connected in parallel to one of the sheets (3, 4). in the preferred embodiment is the electrical Parallel connection to the more thermally sensitive or thinner sheet (4).
- the additional conductor (5) spaced from the sheets (3,4) and with the parallel connected sheet metal (4) at each end Additional connection lines (11) connected.
- the additional manager (5) is rod-shaped and parallel to the gap (7) or the sheet metal edges aligned. He can do his Cross-sectional shape, especially its contour close to the gap, also change over the length and tabs and / or Have deepening.
- the additional conductor (5) forms a current bridge that one Derives part of the current. Im more thermally sensitive or thinner sheet (4), this makes the current flow decreased. In the additional electrical conductor (5) and in the sheet (4) the current flow directions are the same.
- the additional conductor (5) is in a suitable one Holding device (not shown) arranged. This is preferably adjustable so that the distance (17) to the sheet (4) can be changed. in the The exemplary embodiment of FIGS. 1 and 2 is the distance (17) between the additional conductor (5) and the sheet metal (4) so large that that inductive influences are largely suppressed and the inductive resistance of the loop largely reduced is.
- the Additional conductor (5) over the thermally insensitive or thicker sheet (3) arranged.
- the additional connection lines (11) in this case bridge the gap (7) and are again connected to the ends of the sheet (4).
- the additional conductor (5) is in one relatively small distance above the sheet (3). The distance is preferably less than in the embodiment of Fig. 1 and 2.
- the additional conductor (5) extends close and along the gap (7) or the sheet metal edge there.
- the inductive influence of the formed by the additional conductor (5) and the sheet (4) Conductor loop effective.
- the current flows in here Opposite direction to the current direction in the sheet (3). This causes a current concentration in the upper area of the sheet (3), which faces the additional conductor (5) and the gap (7).
- Fig. 5 shows an alternative to current dissipation or different heating of the two sheets (3,4) by means of different clamping elements (15, 16). Therefor there are several options.
- one or both clamping elements (15, 16) through the conductive contact with the workpieces (3,4) as Current bridge act like the additional conductor (5).
- At least one tensioning element (16) is then electrical conductive and the other not.
- the clamping elements (15,16) in the cross-sectional shape, especially in the Height near the gap and thus in the resistance differentiate.
- the cross section can vary over the length also change and e.g. tooth-like or bead-like projections and / or have depressions. These contour changes are preferably on the side near the gap Find clamping elements (15, 16).
- the clamping element (16) with the higher electrical conductivity or the lower Resistance is also more thermally sensitive here Sheet (4) assigned.
- Another option is to choose the Distance (17) between the clamping elements (15, 16) and the edge of the respective sheet (3, 4) near the gap. Of the Distance (17) is also called the unclamping length. Of the Distance (17) can be achieved by positioning the Sheets (3,4) in the clamping elements (15,16) determined will. A change in distance is also due to Shape of the clamping elements (15, 16) and the aforementioned Contour change achievable. On the ledges is the Distance (17) smaller and larger in the depressions. Each the smaller the distance (17), the greater the influence and Effect of current dissipation. The distance (17) is at thermally sensitive sheet (4) smaller than the another sheet (3) selected.
- One is influenced by another Thermal conductivity of the clamping elements (15, 16), possibly in Connection with varying distances (17) and / or Clamping element shapes possible. This allows one accordingly different heat dissipation from the Achieve sheet metal edges.
- the tensioning elements (15, 16) in the Distinguish permeability Preferably only one is the clamping elements (15, 16) ferromagnetic and the other Not. With a ferromagnetic clamping element (15, 16) the energy distribution in the gap area can be strong influence. The ferromagnetic clamping element (16) the thermally more sensitive or thinner sheet (4) assigned.
- FIG. 6 shows a design variant of the sheets (3, 4) and the tensioning elements (15, 16).
- the two sheets (3,4) have an elongated profile shape and own a substantially C-shaped cross section. Such Profiles are e.g. B. in automotive engineering for Body bars used.
- the two sheets (3,4) will be at their front edges with the one described above Welding technology connected.
- the tensioning elements (15, 16) are the contour (18) of the sheets (3, 4) is reproduced and encompass the sheets (3, 4) preferably inside and outside. They are in the manner described above by far arranged front sheet metal edges, like that Side view of Figure 6 in the left part shows.
- the clamping devices overlap (15,16) the sheets (3,4) preferably over the entire Scope and close flush with the longitudinal edges of the Sheet metal (3,4).
- the tensioning elements (15, 16) can alternatively interrupted in places or in individual Clamping claws can be divided into a suitable one electrical or magnetic connection with each other consists.
- connection points of the Lines (9,10,11) do not have to be at the ends of the sheets (3,4), but can be used for shorter seam lengths lie further inside. It is recommended that Connection points near the gap (7) and at the ends of the desired seam.
- the additional conductor (5) does not have the same length as extend the sheet (4).
- the Additional connection lines (11) not on the sheet metal (4) be connected, but can be connected to other suitable Way electrically parallel to the current flow in the workpiece (4) be switched. If necessary, the additional conductor (5) also be connected directly to the power source (2).
- the Current directions in the additional conductor (5) or Clamping elements (15, 16) and in the more thermally sensitive Sheet (4) should, however, be aligned in the same direction.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Induction Heating (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Resistance Welding (AREA)
Description
- Figur 1:
- eine schematische Draufsicht auf eine Schweißanordnung mit einem Zusatzleiter über dem thermisch empfindlicheren Blech,
- Figur 2:
- eine Stirnansicht der Anordnung von Figur 1 in Richtung von Pfeil II,
- Figur 3:
- eine alternative Anordnung mit dem Zusatzleiter auf dem thermisch unempfindlicheren Werkstück,
- Figur 4:
- eine Stirnansicht der Anordnung von Figur 3 gemäß Pfeil IV von Figur 3,
- Figur 5:
- eine Stirnansicht einer alternativen Schweißanordnung mit unterschiedlichen Spannelementen,
- Figur 6:
- eine Variante der Werkstück- und Spanngeometrie in Seiten- und Stirnansicht und
- Figur 7:
- ein Stromprogramm im Ablaufdiagramm.
- 1
- Schweißvorrichtung, Schweißanordnung
- 2
- Stromquelle, Generator
- 3
- Werkstück, Blech, dick
- 4
- Werkstück, Blech, dünn
- 5
- Zusatzleiter
- 6
- Stromrichtung
- 7
- Spalt
- 8
- Stauchantrieb
- 9
- Anschlußleitung (Blech)
- 10
- Verbindungsleitung (Bleche)
- 11
- Zusatzanschlußleitung
- 12
- Steuerung
- 13
- Erwärmungsgradient
- 14
- Einspannung
- 15
- Spannelement
- 16
- Spannelement
- 17
- Abstand, Ausspannlänge
- 18
- Kontur
- 19
- Stromimpuls
- 20
- Pause
- 21
- Grundstrom
- 22
- Erhöhung
- 23
- Beschichtung
Claims (23)
- Verfahren zum Schweißen von Werkstücken, insbesondere Blechen, wobei die Werkstücke an den zu verschweißenden Rändern mit Hilfe eines hochfrequenten Wechselstroms konduktiv oder induktiv erwärmt und anschließend unter Druck miteinander verbunden werden, dadurch gekennzeichnet, daß mit einem Stromprogramm geschweißt wird, das die Werkstücke (3,4) über mehrere Zeitabschnitte mit unterschiedlich hohen Heizströmen beaufschlagt, wobei der Heizstron kurz vor oder bei Stauchbeginn kurzzeitig über den Grundstrom (21) erhöht (22) wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Amplitude der Erhöhung (22) das Zwei- bis Dreifache des Grundstroms (21) beträgt.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Erhöhung (22) eine Dauer von ca. 50 bis 300 msec hat.
- Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß zum Entfernen einer Beschichtung (23) auf den Werkstücken (3,4) vor oder zu Beginn des Schweißprozesses an die Werkstücke (3,4) ein oder mehrere Stromimpulse (19) mit einer über dem Grundstrom (21) liegenden Amplitude gelegt werden.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Höhe und Dauer der Stromimpulse (19) derart gesteuert wird, daß durch die Erwärmung der Ränder der Werkstücke (3,4) die Beschichtung (23) an diesen Stellen verdampft.
- Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der zweite Stromimpuls (19) kürzer als der erste ist.
- Verfahren nach Anspruch 4, 5 oder 6, dadurch gekennzeichnet, daß zwischen den Stromimpulse (19) eine Pause (20) mit Verringerung oder Abschaltung des Stroms liegt, wobei die Ränder der Werkstücke (3,4) abkühlen.
- Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß nach den Stromimpulsen (19) eine Pause (20) mit Verringerung oder Abschaltung des Stroms folgt.
- Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß die Werkstücke (3,4) zumindest an den zu schweißenden Rändern eine gewölbte Kontur (18) aufweisen und mit der Kontur (18) angepaßten Spannelementen (15,16) gespannt werden.
- Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß Werkstücke (3,4) mit unterschiedlichen Dicken oder unterschiedlichen Werkstoffen mit unterschiedlicher Wärmeeinbringung bzw. Energiezufuhr beaufschlagt werden.
- Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß ein Werkstück (3) durch Stromkonzentration über die Dicke unterschiedlich erwärmt wird.
- Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der Stromdurchfluß durch einen parallel geschalteten stromdurchflossenen elektrischen Zusatzleiter (5) beeinflußt wird.
- Verfahren nach Anspruch 12, dadurch gekennzeichnet, daß der Stromdurchfluß am Werkstück (3,4) durch Veränderung des Abstands zwischen dem Zusatzleiter (5) und dem Werkstück (3,4) eingestellt wird.
- Verfahren nach Anspruch 12 oder 13, dadurch gekennzeichnet, daß der Zusatzleiter (5) mit geringem Abstand über dem thermisch unempfindlicheren Werkstück (3) gehalten wird, wobei ein Erwärmungsgradient (13) über die Werkstückdicke eingestellt wird.
- Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß beim Stauchen der Vorschub und die Werkstückverkürzung gemessen bzw. berechnet werden.
- Verfahren nach Anspruch 1 oder einem der folgenden, dadurch gekennzeichnet, daß der Erwärmungsprozeß nach der Zeit, der zugeführten Energie oder der Temperatur gesteuert wird.
- Anordnung zum Schweißen von Werkstücken, insbesondere Blechen, wobei die Werkstücke an den zu verschweißenden Rändern mit Hilfe einer Stromquelle zur Erzeugung eines hochfrequenten Wechselstroms konduktiv oder induktiv erwärmt und anschließend unter Druck miteinander verbunden werden, dadurch gekennzeichnet, daß die Stromquelle (2) eine programmierbare Steuerung (12) mit Datenspeicher und einem Stromprogramm aufweist, das die Werkstücke (3,4) über mehrere Zeitabschnitte mit unterschiedlich hohen Heizströmen beaufschlagt und den Heizstrom kurz vor oder bei Stauchbeginn kurzzeitlg erhöht.
- Anordnung nach Anspruch 17, dadurch gekennzeichnet, daß das Stromprogramm zum Entfernen einer Beschichtung (23) auf den Werkstücken (3,4) vor oder zu Beginn des Schweißprozesses an die Werkstücke (3,4) ein oder mehrere Stromimpulse (19) mit einer über dem Grundstrom (21) liegenden Amplitude legt.
- Anordnung nach Anspruch 17 oder 18, dadurch gekennzeichnet, daß die Werkstücke (3,4) zumindest an den zu schweißenden Rändern eine gewölbte Kontur (18) aufweisen und die Spannelemente (15,16) eine der Kontur (18) angepaßte Form besitzen.
- Anordnung nach Anspruch 17, 18 oder 19, dadurch gekennzeichnet, daß zumindest ein stromdurchflossener elektrischer Zusatzleiter (5) mit einem der Werkstücke (3,4) elektrisch parallel geschaltet und mit Abstand über einem Werkstück (3,4) angeordnet ist.
- Anordnung nach Anspruch 20, dadurch gekennzeichnet, daß unterschiedlich dicke Werkstücke (3,4) an einer Oberfläche höhenbündig zueinander ausgerichtet sind und der Zusatzleiter (5) mit Abstand über dieser Oberfläche und dem dickeren Werkstück (3) positioniert ist.
- Anordnung nach einem der Ansprüche 17 bis 21, dadurch gekennzeichnet, daß die Spannelemente (15,16) zur Steuerung der Energiezufuhr in der Form, in der Wärme- oder elektrischen Leitfähigkeit, in der Permeabilität und/oder der Ausspannlänge (17) unterschiedlich ausgebildet sind.
- Anordnung nach einem der Ansprüche 17 bis 22, dadurch gekennzeichnet, daß die Steuerung (12) mit Meßeinrichtungen zur Temperatur-, Energie- und/oder Zeiterfassung verbunden ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4426894 | 1994-07-29 | ||
DE4426894A DE4426894A1 (de) | 1994-04-25 | 1994-07-29 | Verfahren und Anordnung zum Schweißen von Werkstücken |
PCT/EP1995/002856 WO1996004099A1 (de) | 1994-07-29 | 1995-07-20 | Verfahren und anordnung zum schweissen von werkstücken |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0772508A1 EP0772508A1 (de) | 1997-05-14 |
EP0772508B1 true EP0772508B1 (de) | 1998-12-09 |
Family
ID=6524441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95927670A Expired - Lifetime EP0772508B1 (de) | 1994-07-29 | 1995-07-20 | Verfahren und anordnung zum schweissen von werkstücken |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0772508B1 (de) |
CZ (1) | CZ286955B6 (de) |
ES (1) | ES2125034T3 (de) |
WO (1) | WO1996004099A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7683288B2 (en) * | 2005-08-12 | 2010-03-23 | Thermatool Corp. | System and method of computing the operating parameters of a forge welding machine |
DE102010061454A1 (de) * | 2010-12-21 | 2012-06-21 | Thyssenkrupp Steel Europe Ag | Hochfrequenzschweißen von Sandwichblechen |
DE102018003156A1 (de) | 2018-04-18 | 2018-09-27 | Daimler Ag | Verfahren zum Herstellen von beschichteten Bauteilen, sowie beschichtetes Bauteil, hergestellt nach einem solchen Verfahren |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2625637A (en) * | 1948-03-30 | 1953-01-13 | Rca Corp | High-frequency induction welding apparatus and process |
US3482073A (en) * | 1966-08-12 | 1969-12-02 | American Mach & Foundry | Methods for welding seams |
US3794805A (en) * | 1971-07-02 | 1974-02-26 | W Rudd | Magnetic pulse welding using spaced proximity conductor |
FR2399299A1 (fr) * | 1977-08-05 | 1979-03-02 | Tocco Stel | Procede et dispositif de soudage bout a bout par induction de pieces metalliques, notamment de section irreguliere |
US4197441A (en) * | 1978-05-01 | 1980-04-08 | Thermatool Corporation | High frequency induction welding with return current paths on surfaces to be heated |
-
1995
- 1995-07-20 CZ CZ1997174A patent/CZ286955B6/cs not_active IP Right Cessation
- 1995-07-20 EP EP95927670A patent/EP0772508B1/de not_active Expired - Lifetime
- 1995-07-20 ES ES95927670T patent/ES2125034T3/es not_active Expired - Lifetime
- 1995-07-20 WO PCT/EP1995/002856 patent/WO1996004099A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
WO1996004099A1 (de) | 1996-02-15 |
CZ17497A3 (en) | 1997-05-14 |
EP0772508A1 (de) | 1997-05-14 |
ES2125034T3 (es) | 1999-02-16 |
CZ286955B6 (en) | 2000-08-16 |
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